Originally Posted by Koehne
Well, isn't Carafa already roasted? Then it indeed is stout. o/
But my doubt here is if I can still add the oats to get an Oatmeal Stout, and/or adding boiled honey or cocoa powder would fit the other ingredients' flavor.
Carafa is roasted malted barley. Stouts include roasted unmalted barley. Feel free to call it what you like, but this is the defining difference between Porter and Stout.
I don't think you should try anything with the oatmeal. Oatmeal is mainly added for texture and body and won't alter flavor at all which is what you seem to be after. Moreover, it should be mashed with diastatic grains.
I'd leave it as is to see what you've got after it has fermented and you have carbonated, but adding vanilla beans, crushed coffee beans, cocoa nibs, a dose of dry hops or some flavored extract such as hazelnut will certainly flavor up your beer. Extracts may be a good possibility as it is easy to take a post fermentation sample and see how much extract you need to add with a dropper or pipette to get the desired flavor. All the beer can be dosed or you can do the extract additions at bottling time to some subset of the bottles.